From 736 to 741, the relations between Charles and Hunald seem to have remained amicable, but upon Charles's death in 741, Hunald declared war against the Franks. Pepin and Carloman in turn crossed the Loire, ransacked the region of Berry and the outskirts of Bourges and, later, destroyed the castle of Loches and took prisoners all its inhabitants. Hunald seems to have retaliated by rampaging and burning Chartres. However, Hunald begged for peace in 744 and retired to a monastery, probably on the Île de Ré.[2]

We find him later in Italy, where he allied himself with the Papacy against the Lombards and was killed defending Rome during the Lombard king Aistulf's siege.[3] He had left the duchy of Aquitaine to Waifer, who was probably his son, and who struggled for eight years in defending his independence.

At the death of Pepin and at the beginning of the reign of Charlemagne, there was a last rising of the Aquitanians. This revolt was directed by a certain Hunald and was repressed in 769 by Charlemagne and his brother Carloman. A certain Hunald sought refuge with the duke of the Gascons, Lupus, who handed him over to his enemies. In spite of the opinion of certain historians, this Hunald seems to have been a different person (Hunald II) from the old duke of Aquitaine.[4]